Study of the 237 Np(n,f)-reaction at MeV neutron energies

✍ Scribed by F.-J Hambsch; F Vivès; P Siegler; S Oberstedt

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 332 KB
• Volume: 679
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(00)00338-9

✦ Synopsis

The fission fragment properties of the reaction 237 Np(n, f ) have been investigated at IRMM in the neutron energy range E n = 0.3 to 5.5 MeV. Above E n = 0.5 MeV, the TKE averaged over all fission fragment masses shows a continuously decreasing trend. The observed variations in the TKE as a function of the compound nuclear excitation energy have been attributed to a combination of the changes in the mass yield and TKE(A) distributions. A description of the two-dimensional mass-TKE distributions has been obtained in terms of fission modes in the frame of the multimodal random neck-rupture model. The inclusion of the superlong symmetric mode is necessary to explain the observed dip in the experimental TKE close to symmetry.